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Cian Mansfield specialises in competition damages litigation before the English High Court, Competition Appeal Tribunal, and the Court of Appeal.


  • Acting as lead associate for a large number of retailers in their claims in the English High Court against Visa and MasterCard in relation to anti-competitive interchange fees.
  • Acting as lead associate on behalf of a number of potential claimants in follow-on damage actions arising from the Trucks cartel.
  • Spent over six years in the London office of Freshfields Bruckhaus Deringer LLP, acting in many of the leading English competition damages cases, including National Grid Electricity Transmission Plc v ABB, arising from the gas-insulated switchgear (GIS) cartel and in numerous competition law investigations, both confidential internal investigations and those brought by the Competition and Markets Authority, the European Commission, and other regulators


  • Admitted to practice in England & Wales (including Higher Rights of Audience) and the Republic of Ireland


  • King’s College London (Postgraduate Diploma in Competition Law, 2014)
  • University of Cambridge (LL.M, 2009)
  • University College Dublin (Bachelor of Civil Law, 2007, First Class Honours) (including exchange year at the University of Lausanne in Switzerland)


  • Completed a five-month stage (internship) at the Legal Service of the European Commission in Brussels
  • Published on competition law